The 14 Pūrvas have never been lost
for inspecting what are stating the Agamas on the controversal note in Yuga-pradhān no. 27 Mānadeva in the list of Paṭṭavalī of the Tapāgaccha, which states:
The 14 pūrvas are listed amongst the ten things lost.
What, when not lost... where are they?